Suggestion:
There is a very nice iPad X3 catalog app that lets you visualize some of the specifications. You can visualize interior and exterior, but in separate windows. However, it can help you a lot, for example, to see the combos of the seat colors and trims in the car from two different perspectives.
My the most favorite combo is Mineral Silver outside and Beige seats with Siena Wood inside. I did not order Beige seats for myself being concerned how it would show dirt and other smudges, but to me this is the ultimate look.

For myself, I have ordered Mineral Silver outside and Brown Nevada Mojave with Siena Wood for interior.

If you do not have iPad handy, I can take a few screen shots of combos for you that you may wish to see this way.

Thanks! I just installed the app it is really good and helps vizualizing better than bmw on-line